1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Nuvoton Technology corporation.
3
4 #include <linux/bits.h>
5 #include <linux/init.h>
6 #include <linux/kernel.h>
7 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/ioport.h>
10 #include <linux/clk.h>
11 #include <linux/platform_device.h>
12 #include <linux/io.h>
13 #include <linux/vmalloc.h>
14 #include <linux/regmap.h>
15 #include <linux/of.h>
16 #include <linux/spi/spi-mem.h>
17 #include <linux/mfd/syscon.h>
18
19 /* NPCM7xx GCR module */
20 #define NPCM7XX_INTCR3_OFFSET 0x9C
21 #define NPCM7XX_INTCR3_FIU_FIX BIT(6)
22
23 /* Flash Interface Unit (FIU) Registers */
24 #define NPCM_FIU_DRD_CFG 0x00
25 #define NPCM_FIU_DWR_CFG 0x04
26 #define NPCM_FIU_UMA_CFG 0x08
27 #define NPCM_FIU_UMA_CTS 0x0C
28 #define NPCM_FIU_UMA_CMD 0x10
29 #define NPCM_FIU_UMA_ADDR 0x14
30 #define NPCM_FIU_PRT_CFG 0x18
31 #define NPCM_FIU_UMA_DW0 0x20
32 #define NPCM_FIU_UMA_DW1 0x24
33 #define NPCM_FIU_UMA_DW2 0x28
34 #define NPCM_FIU_UMA_DW3 0x2C
35 #define NPCM_FIU_UMA_DR0 0x30
36 #define NPCM_FIU_UMA_DR1 0x34
37 #define NPCM_FIU_UMA_DR2 0x38
38 #define NPCM_FIU_UMA_DR3 0x3C
39 #define NPCM_FIU_CFG 0x78
40 #define NPCM_FIU_MAX_REG_LIMIT 0x80
41
42 /* FIU Direct Read Configuration Register */
43 #define NPCM_FIU_DRD_CFG_LCK BIT(31)
44 #define NPCM_FIU_DRD_CFG_R_BURST GENMASK(25, 24)
45 #define NPCM_FIU_DRD_CFG_ADDSIZ GENMASK(17, 16)
46 #define NPCM_FIU_DRD_CFG_DBW GENMASK(13, 12)
47 #define NPCM_FIU_DRD_CFG_ACCTYPE GENMASK(9, 8)
48 #define NPCM_FIU_DRD_CFG_RDCMD GENMASK(7, 0)
49 #define NPCM_FIU_DRD_ADDSIZ_SHIFT 16
50 #define NPCM_FIU_DRD_DBW_SHIFT 12
51 #define NPCM_FIU_DRD_ACCTYPE_SHIFT 8
52
53 /* FIU Direct Write Configuration Register */
54 #define NPCM_FIU_DWR_CFG_LCK BIT(31)
55 #define NPCM_FIU_DWR_CFG_W_BURST GENMASK(25, 24)
56 #define NPCM_FIU_DWR_CFG_ADDSIZ GENMASK(17, 16)
57 #define NPCM_FIU_DWR_CFG_ABPCK GENMASK(11, 10)
58 #define NPCM_FIU_DWR_CFG_DBPCK GENMASK(9, 8)
59 #define NPCM_FIU_DWR_CFG_WRCMD GENMASK(7, 0)
60 #define NPCM_FIU_DWR_ADDSIZ_SHIFT 16
61 #define NPCM_FIU_DWR_ABPCK_SHIFT 10
62 #define NPCM_FIU_DWR_DBPCK_SHIFT 8
63
64 /* FIU UMA Configuration Register */
65 #define NPCM_FIU_UMA_CFG_LCK BIT(31)
66 #define NPCM_FIU_UMA_CFG_CMMLCK BIT(30)
67 #define NPCM_FIU_UMA_CFG_RDATSIZ GENMASK(28, 24)
68 #define NPCM_FIU_UMA_CFG_DBSIZ GENMASK(23, 21)
69 #define NPCM_FIU_UMA_CFG_WDATSIZ GENMASK(20, 16)
70 #define NPCM_FIU_UMA_CFG_ADDSIZ GENMASK(13, 11)
71 #define NPCM_FIU_UMA_CFG_CMDSIZ BIT(10)
72 #define NPCM_FIU_UMA_CFG_RDBPCK GENMASK(9, 8)
73 #define NPCM_FIU_UMA_CFG_DBPCK GENMASK(7, 6)
74 #define NPCM_FIU_UMA_CFG_WDBPCK GENMASK(5, 4)
75 #define NPCM_FIU_UMA_CFG_ADBPCK GENMASK(3, 2)
76 #define NPCM_FIU_UMA_CFG_CMBPCK GENMASK(1, 0)
77 #define NPCM_FIU_UMA_CFG_ADBPCK_SHIFT 2
78 #define NPCM_FIU_UMA_CFG_WDBPCK_SHIFT 4
79 #define NPCM_FIU_UMA_CFG_DBPCK_SHIFT 6
80 #define NPCM_FIU_UMA_CFG_RDBPCK_SHIFT 8
81 #define NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT 11
82 #define NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT 16
83 #define NPCM_FIU_UMA_CFG_DBSIZ_SHIFT 21
84 #define NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT 24
85
86 /* FIU UMA Control and Status Register */
87 #define NPCM_FIU_UMA_CTS_RDYIE BIT(25)
88 #define NPCM_FIU_UMA_CTS_RDYST BIT(24)
89 #define NPCM_FIU_UMA_CTS_SW_CS BIT(16)
90 #define NPCM_FIU_UMA_CTS_DEV_NUM GENMASK(9, 8)
91 #define NPCM_FIU_UMA_CTS_EXEC_DONE BIT(0)
92 #define NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT 8
93
94 /* FIU UMA Command Register */
95 #define NPCM_FIU_UMA_CMD_DUM3 GENMASK(31, 24)
96 #define NPCM_FIU_UMA_CMD_DUM2 GENMASK(23, 16)
97 #define NPCM_FIU_UMA_CMD_DUM1 GENMASK(15, 8)
98 #define NPCM_FIU_UMA_CMD_CMD GENMASK(7, 0)
99
100 /* FIU UMA Address Register */
101 #define NPCM_FIU_UMA_ADDR_UMA_ADDR GENMASK(31, 0)
102 #define NPCM_FIU_UMA_ADDR_AB3 GENMASK(31, 24)
103 #define NPCM_FIU_UMA_ADDR_AB2 GENMASK(23, 16)
104 #define NPCM_FIU_UMA_ADDR_AB1 GENMASK(15, 8)
105 #define NPCM_FIU_UMA_ADDR_AB0 GENMASK(7, 0)
106
107 /* FIU UMA Write Data Bytes 0-3 Register */
108 #define NPCM_FIU_UMA_DW0_WB3 GENMASK(31, 24)
109 #define NPCM_FIU_UMA_DW0_WB2 GENMASK(23, 16)
110 #define NPCM_FIU_UMA_DW0_WB1 GENMASK(15, 8)
111 #define NPCM_FIU_UMA_DW0_WB0 GENMASK(7, 0)
112
113 /* FIU UMA Write Data Bytes 4-7 Register */
114 #define NPCM_FIU_UMA_DW1_WB7 GENMASK(31, 24)
115 #define NPCM_FIU_UMA_DW1_WB6 GENMASK(23, 16)
116 #define NPCM_FIU_UMA_DW1_WB5 GENMASK(15, 8)
117 #define NPCM_FIU_UMA_DW1_WB4 GENMASK(7, 0)
118
119 /* FIU UMA Write Data Bytes 8-11 Register */
120 #define NPCM_FIU_UMA_DW2_WB11 GENMASK(31, 24)
121 #define NPCM_FIU_UMA_DW2_WB10 GENMASK(23, 16)
122 #define NPCM_FIU_UMA_DW2_WB9 GENMASK(15, 8)
123 #define NPCM_FIU_UMA_DW2_WB8 GENMASK(7, 0)
124
125 /* FIU UMA Write Data Bytes 12-15 Register */
126 #define NPCM_FIU_UMA_DW3_WB15 GENMASK(31, 24)
127 #define NPCM_FIU_UMA_DW3_WB14 GENMASK(23, 16)
128 #define NPCM_FIU_UMA_DW3_WB13 GENMASK(15, 8)
129 #define NPCM_FIU_UMA_DW3_WB12 GENMASK(7, 0)
130
131 /* FIU UMA Read Data Bytes 0-3 Register */
132 #define NPCM_FIU_UMA_DR0_RB3 GENMASK(31, 24)
133 #define NPCM_FIU_UMA_DR0_RB2 GENMASK(23, 16)
134 #define NPCM_FIU_UMA_DR0_RB1 GENMASK(15, 8)
135 #define NPCM_FIU_UMA_DR0_RB0 GENMASK(7, 0)
136
137 /* FIU UMA Read Data Bytes 4-7 Register */
138 #define NPCM_FIU_UMA_DR1_RB15 GENMASK(31, 24)
139 #define NPCM_FIU_UMA_DR1_RB14 GENMASK(23, 16)
140 #define NPCM_FIU_UMA_DR1_RB13 GENMASK(15, 8)
141 #define NPCM_FIU_UMA_DR1_RB12 GENMASK(7, 0)
142
143 /* FIU UMA Read Data Bytes 8-11 Register */
144 #define NPCM_FIU_UMA_DR2_RB15 GENMASK(31, 24)
145 #define NPCM_FIU_UMA_DR2_RB14 GENMASK(23, 16)
146 #define NPCM_FIU_UMA_DR2_RB13 GENMASK(15, 8)
147 #define NPCM_FIU_UMA_DR2_RB12 GENMASK(7, 0)
148
149 /* FIU UMA Read Data Bytes 12-15 Register */
150 #define NPCM_FIU_UMA_DR3_RB15 GENMASK(31, 24)
151 #define NPCM_FIU_UMA_DR3_RB14 GENMASK(23, 16)
152 #define NPCM_FIU_UMA_DR3_RB13 GENMASK(15, 8)
153 #define NPCM_FIU_UMA_DR3_RB12 GENMASK(7, 0)
154
155 /* FIU Configuration Register */
156 #define NPCM_FIU_CFG_FIU_FIX BIT(31)
157
158 /* FIU Read Mode */
159 enum {
160 DRD_SINGLE_WIRE_MODE = 0,
161 DRD_DUAL_IO_MODE = 1,
162 DRD_QUAD_IO_MODE = 2,
163 DRD_SPI_X_MODE = 3,
164 };
165
166 enum {
167 DWR_ABPCK_BIT_PER_CLK = 0,
168 DWR_ABPCK_2_BIT_PER_CLK = 1,
169 DWR_ABPCK_4_BIT_PER_CLK = 2,
170 };
171
172 enum {
173 DWR_DBPCK_BIT_PER_CLK = 0,
174 DWR_DBPCK_2_BIT_PER_CLK = 1,
175 DWR_DBPCK_4_BIT_PER_CLK = 2,
176 };
177
178 #define NPCM_FIU_DRD_16_BYTE_BURST 0x3000000
179 #define NPCM_FIU_DWR_16_BYTE_BURST 0x3000000
180
181 #define MAP_SIZE_128MB 0x8000000
182 #define MAP_SIZE_16MB 0x1000000
183 #define MAP_SIZE_8MB 0x800000
184
185 #define FIU_DRD_MAX_DUMMY_NUMBER 3
186 #define NPCM_MAX_CHIP_NUM 4
187 #define CHUNK_SIZE 16
188 #define UMA_MICRO_SEC_TIMEOUT 150
189
190 enum {
191 FIU0 = 0,
192 FIU3,
193 FIUX,
194 FIU1,
195 };
196
197 struct npcm_fiu_info {
198 char *name;
199 u32 fiu_id;
200 u32 max_map_size;
201 u32 max_cs;
202 };
203
204 struct fiu_data {
205 const struct npcm_fiu_info *npcm_fiu_data_info;
206 int fiu_max;
207 };
208
209 static const struct npcm_fiu_info npcm7xx_fiu_info[] = {
210 {.name = "FIU0", .fiu_id = FIU0,
211 .max_map_size = MAP_SIZE_128MB, .max_cs = 2},
212 {.name = "FIU3", .fiu_id = FIU3,
213 .max_map_size = MAP_SIZE_128MB, .max_cs = 4},
214 {.name = "FIUX", .fiu_id = FIUX,
215 .max_map_size = MAP_SIZE_16MB, .max_cs = 2} };
216
217 static const struct fiu_data npcm7xx_fiu_data = {
218 .npcm_fiu_data_info = npcm7xx_fiu_info,
219 .fiu_max = 3,
220 };
221
222 static const struct npcm_fiu_info npxm8xx_fiu_info[] = {
223 {.name = "FIU0", .fiu_id = FIU0,
224 .max_map_size = MAP_SIZE_128MB, .max_cs = 2},
225 {.name = "FIU3", .fiu_id = FIU3,
226 .max_map_size = MAP_SIZE_128MB, .max_cs = 4},
227 {.name = "FIUX", .fiu_id = FIUX,
228 .max_map_size = MAP_SIZE_16MB, .max_cs = 2},
229 {.name = "FIU1", .fiu_id = FIU1,
230 .max_map_size = MAP_SIZE_16MB, .max_cs = 4} };
231
232 static const struct fiu_data npxm8xx_fiu_data = {
233 .npcm_fiu_data_info = npxm8xx_fiu_info,
234 .fiu_max = 4,
235 };
236
237 struct npcm_fiu_spi;
238
239 struct npcm_fiu_chip {
240 void __iomem *flash_region_mapped_ptr;
241 struct npcm_fiu_spi *fiu;
242 unsigned long clkrate;
243 u32 chipselect;
244 };
245
246 struct npcm_fiu_spi {
247 struct npcm_fiu_chip chip[NPCM_MAX_CHIP_NUM];
248 const struct npcm_fiu_info *info;
249 struct spi_mem_op drd_op;
250 struct resource *res_mem;
251 struct regmap *regmap;
252 unsigned long clkrate;
253 struct device *dev;
254 struct clk *clk;
255 bool spix_mode;
256 };
257
258 static const struct regmap_config npcm_mtd_regmap_config = {
259 .reg_bits = 32,
260 .val_bits = 32,
261 .reg_stride = 4,
262 .max_register = NPCM_FIU_MAX_REG_LIMIT,
263 };
264
npcm_fiu_set_drd(struct npcm_fiu_spi * fiu,const struct spi_mem_op * op)265 static void npcm_fiu_set_drd(struct npcm_fiu_spi *fiu,
266 const struct spi_mem_op *op)
267 {
268 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
269 NPCM_FIU_DRD_CFG_ACCTYPE,
270 ilog2(op->addr.buswidth) <<
271 NPCM_FIU_DRD_ACCTYPE_SHIFT);
272 fiu->drd_op.addr.buswidth = op->addr.buswidth;
273 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
274 NPCM_FIU_DRD_CFG_DBW,
275 op->dummy.nbytes << NPCM_FIU_DRD_DBW_SHIFT);
276 fiu->drd_op.dummy.nbytes = op->dummy.nbytes;
277 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
278 NPCM_FIU_DRD_CFG_RDCMD, op->cmd.opcode);
279 fiu->drd_op.cmd.opcode = op->cmd.opcode;
280 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
281 NPCM_FIU_DRD_CFG_ADDSIZ,
282 (op->addr.nbytes - 3) << NPCM_FIU_DRD_ADDSIZ_SHIFT);
283 fiu->drd_op.addr.nbytes = op->addr.nbytes;
284 }
285
npcm_fiu_direct_read(struct spi_mem_dirmap_desc * desc,u64 offs,size_t len,void * buf)286 static ssize_t npcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc,
287 u64 offs, size_t len, void *buf)
288 {
289 struct npcm_fiu_spi *fiu =
290 spi_controller_get_devdata(desc->mem->spi->controller);
291 struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
292 void __iomem *src = (void __iomem *)(chip->flash_region_mapped_ptr +
293 offs);
294 u8 *buf_rx = buf;
295 u32 i;
296
297 if (fiu->spix_mode) {
298 for (i = 0 ; i < len ; i++)
299 *(buf_rx + i) = ioread8(src + i);
300 } else {
301 if (desc->info.op_tmpl.addr.buswidth != fiu->drd_op.addr.buswidth ||
302 desc->info.op_tmpl.dummy.nbytes != fiu->drd_op.dummy.nbytes ||
303 desc->info.op_tmpl.cmd.opcode != fiu->drd_op.cmd.opcode ||
304 desc->info.op_tmpl.addr.nbytes != fiu->drd_op.addr.nbytes)
305 npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
306
307 memcpy_fromio(buf_rx, src, len);
308 }
309
310 return len;
311 }
312
npcm_fiu_direct_write(struct spi_mem_dirmap_desc * desc,u64 offs,size_t len,const void * buf)313 static ssize_t npcm_fiu_direct_write(struct spi_mem_dirmap_desc *desc,
314 u64 offs, size_t len, const void *buf)
315 {
316 struct npcm_fiu_spi *fiu =
317 spi_controller_get_devdata(desc->mem->spi->controller);
318 struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
319 void __iomem *dst = (void __iomem *)(chip->flash_region_mapped_ptr +
320 offs);
321 const u8 *buf_tx = buf;
322 u32 i;
323
324 if (fiu->spix_mode)
325 for (i = 0 ; i < len ; i++)
326 iowrite8(*(buf_tx + i), dst + i);
327 else
328 memcpy_toio(dst, buf_tx, len);
329
330 return len;
331 }
332
npcm_fiu_uma_read(struct spi_mem * mem,const struct spi_mem_op * op,u32 addr,bool is_address_size,u8 * data,u32 data_size)333 static int npcm_fiu_uma_read(struct spi_mem *mem,
334 const struct spi_mem_op *op, u32 addr,
335 bool is_address_size, u8 *data, u32 data_size)
336 {
337 struct npcm_fiu_spi *fiu =
338 spi_controller_get_devdata(mem->spi->controller);
339 u32 uma_cfg = BIT(10);
340 u32 data_reg[4];
341 int ret;
342 u32 val;
343 u32 i;
344
345 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
346 NPCM_FIU_UMA_CTS_DEV_NUM,
347 (spi_get_chipselect(mem->spi, 0) <<
348 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
349 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
350 NPCM_FIU_UMA_CMD_CMD, op->cmd.opcode);
351
352 if (is_address_size) {
353 uma_cfg |= ilog2(op->cmd.buswidth);
354 uma_cfg |= ilog2(op->addr.buswidth)
355 << NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
356 if (op->dummy.nbytes)
357 uma_cfg |= ilog2(op->dummy.buswidth)
358 << NPCM_FIU_UMA_CFG_DBPCK_SHIFT;
359 uma_cfg |= ilog2(op->data.buswidth)
360 << NPCM_FIU_UMA_CFG_RDBPCK_SHIFT;
361 uma_cfg |= op->dummy.nbytes << NPCM_FIU_UMA_CFG_DBSIZ_SHIFT;
362 uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
363 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, addr);
364 } else {
365 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
366 }
367
368 uma_cfg |= data_size << NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT;
369 regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
370 regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
371 NPCM_FIU_UMA_CTS_EXEC_DONE,
372 NPCM_FIU_UMA_CTS_EXEC_DONE);
373 ret = regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
374 (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
375 UMA_MICRO_SEC_TIMEOUT);
376 if (ret)
377 return ret;
378
379 if (data_size) {
380 for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
381 regmap_read(fiu->regmap, NPCM_FIU_UMA_DR0 + (i * 4),
382 &data_reg[i]);
383 memcpy(data, data_reg, data_size);
384 }
385
386 return 0;
387 }
388
npcm_fiu_uma_write(struct spi_mem * mem,const struct spi_mem_op * op,u8 cmd,bool is_address_size,u8 * data,u32 data_size)389 static int npcm_fiu_uma_write(struct spi_mem *mem,
390 const struct spi_mem_op *op, u8 cmd,
391 bool is_address_size, u8 *data, u32 data_size)
392 {
393 struct npcm_fiu_spi *fiu =
394 spi_controller_get_devdata(mem->spi->controller);
395 u32 uma_cfg = BIT(10);
396 u32 data_reg[4] = {0};
397 u32 val;
398 u32 i;
399
400 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
401 NPCM_FIU_UMA_CTS_DEV_NUM,
402 (spi_get_chipselect(mem->spi, 0) <<
403 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
404
405 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
406 NPCM_FIU_UMA_CMD_CMD, cmd);
407
408 if (data_size) {
409 memcpy(data_reg, data, data_size);
410 for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
411 regmap_write(fiu->regmap, NPCM_FIU_UMA_DW0 + (i * 4),
412 data_reg[i]);
413 }
414
415 if (is_address_size) {
416 uma_cfg |= ilog2(op->cmd.buswidth);
417 uma_cfg |= ilog2(op->addr.buswidth) <<
418 NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
419 uma_cfg |= ilog2(op->data.buswidth) <<
420 NPCM_FIU_UMA_CFG_WDBPCK_SHIFT;
421 uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
422 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, op->addr.val);
423 } else {
424 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
425 }
426
427 uma_cfg |= (data_size << NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT);
428 regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
429
430 regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
431 NPCM_FIU_UMA_CTS_EXEC_DONE,
432 NPCM_FIU_UMA_CTS_EXEC_DONE);
433
434 return regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
435 (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
436 UMA_MICRO_SEC_TIMEOUT);
437 }
438
npcm_fiu_manualwrite(struct spi_mem * mem,const struct spi_mem_op * op)439 static int npcm_fiu_manualwrite(struct spi_mem *mem,
440 const struct spi_mem_op *op)
441 {
442 struct npcm_fiu_spi *fiu =
443 spi_controller_get_devdata(mem->spi->controller);
444 u8 *data = (u8 *)op->data.buf.out;
445 u32 num_data_chunks;
446 u32 remain_data;
447 u32 idx = 0;
448 int ret;
449
450 num_data_chunks = op->data.nbytes / CHUNK_SIZE;
451 remain_data = op->data.nbytes % CHUNK_SIZE;
452
453 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
454 NPCM_FIU_UMA_CTS_DEV_NUM,
455 (spi_get_chipselect(mem->spi, 0) <<
456 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
457 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
458 NPCM_FIU_UMA_CTS_SW_CS, 0);
459
460 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, true, NULL, 0);
461 if (ret)
462 return ret;
463
464 /* Starting the data writing loop in multiples of 8 */
465 for (idx = 0; idx < num_data_chunks; ++idx) {
466 ret = npcm_fiu_uma_write(mem, op, data[0], false,
467 &data[1], CHUNK_SIZE - 1);
468 if (ret)
469 return ret;
470
471 data += CHUNK_SIZE;
472 }
473
474 /* Handling chunk remains */
475 if (remain_data > 0) {
476 ret = npcm_fiu_uma_write(mem, op, data[0], false,
477 &data[1], remain_data - 1);
478 if (ret)
479 return ret;
480 }
481
482 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
483 NPCM_FIU_UMA_CTS_SW_CS, NPCM_FIU_UMA_CTS_SW_CS);
484
485 return 0;
486 }
487
npcm_fiu_read(struct spi_mem * mem,const struct spi_mem_op * op)488 static int npcm_fiu_read(struct spi_mem *mem, const struct spi_mem_op *op)
489 {
490 u8 *data = op->data.buf.in;
491 int i, readlen, currlen;
492 u8 *buf_ptr;
493 u32 addr;
494 int ret;
495
496 i = 0;
497 currlen = op->data.nbytes;
498
499 do {
500 addr = ((u32)op->addr.val + i);
501 if (currlen < 16)
502 readlen = currlen;
503 else
504 readlen = 16;
505
506 buf_ptr = data + i;
507 ret = npcm_fiu_uma_read(mem, op, addr, true, buf_ptr,
508 readlen);
509 if (ret)
510 return ret;
511
512 i += readlen;
513 currlen -= 16;
514 } while (currlen > 0);
515
516 return 0;
517 }
518
npcm_fiux_set_direct_wr(struct npcm_fiu_spi * fiu)519 static void npcm_fiux_set_direct_wr(struct npcm_fiu_spi *fiu)
520 {
521 regmap_write(fiu->regmap, NPCM_FIU_DWR_CFG,
522 NPCM_FIU_DWR_16_BYTE_BURST);
523 regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
524 NPCM_FIU_DWR_CFG_ABPCK,
525 DWR_ABPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_ABPCK_SHIFT);
526 regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
527 NPCM_FIU_DWR_CFG_DBPCK,
528 DWR_DBPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_DBPCK_SHIFT);
529 }
530
npcm_fiux_set_direct_rd(struct npcm_fiu_spi * fiu)531 static void npcm_fiux_set_direct_rd(struct npcm_fiu_spi *fiu)
532 {
533 u32 rx_dummy = 0;
534
535 regmap_write(fiu->regmap, NPCM_FIU_DRD_CFG,
536 NPCM_FIU_DRD_16_BYTE_BURST);
537 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
538 NPCM_FIU_DRD_CFG_ACCTYPE,
539 DRD_SPI_X_MODE << NPCM_FIU_DRD_ACCTYPE_SHIFT);
540 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
541 NPCM_FIU_DRD_CFG_DBW,
542 rx_dummy << NPCM_FIU_DRD_DBW_SHIFT);
543 }
544
npcm_fiu_exec_op(struct spi_mem * mem,const struct spi_mem_op * op)545 static int npcm_fiu_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
546 {
547 struct npcm_fiu_spi *fiu =
548 spi_controller_get_devdata(mem->spi->controller);
549 struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(mem->spi, 0)];
550 int ret = 0;
551 u8 *buf;
552
553 dev_dbg(fiu->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
554 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
555 op->dummy.buswidth, op->data.buswidth, op->addr.val,
556 op->data.nbytes);
557
558 if (fiu->spix_mode || op->addr.nbytes > 4)
559 return -EOPNOTSUPP;
560
561 if (fiu->clkrate != chip->clkrate) {
562 ret = clk_set_rate(fiu->clk, chip->clkrate);
563 if (ret < 0)
564 dev_warn(fiu->dev, "Failed setting %lu frequency, stay at %lu frequency\n",
565 chip->clkrate, fiu->clkrate);
566 else
567 fiu->clkrate = chip->clkrate;
568 }
569
570 if (op->data.dir == SPI_MEM_DATA_IN) {
571 if (!op->addr.nbytes) {
572 buf = op->data.buf.in;
573 ret = npcm_fiu_uma_read(mem, op, op->addr.val, false,
574 buf, op->data.nbytes);
575 } else {
576 ret = npcm_fiu_read(mem, op);
577 }
578 } else {
579 if (!op->addr.nbytes && !op->data.nbytes)
580 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
581 NULL, 0);
582 if (op->addr.nbytes && !op->data.nbytes) {
583 int i;
584 u8 buf_addr[4];
585 u32 addr = op->addr.val;
586
587 for (i = op->addr.nbytes - 1; i >= 0; i--) {
588 buf_addr[i] = addr & 0xff;
589 addr >>= 8;
590 }
591 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
592 buf_addr, op->addr.nbytes);
593 }
594 if (!op->addr.nbytes && op->data.nbytes)
595 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
596 (u8 *)op->data.buf.out,
597 op->data.nbytes);
598 if (op->addr.nbytes && op->data.nbytes)
599 ret = npcm_fiu_manualwrite(mem, op);
600 }
601
602 return ret;
603 }
604
npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc * desc)605 static int npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc)
606 {
607 struct npcm_fiu_spi *fiu =
608 spi_controller_get_devdata(desc->mem->spi->controller);
609 struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
610 struct regmap *gcr_regmap;
611
612 if (!fiu->res_mem) {
613 dev_warn(fiu->dev, "Reserved memory not defined, direct read disabled\n");
614 desc->nodirmap = true;
615 return 0;
616 }
617
618 if (!fiu->spix_mode &&
619 desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) {
620 desc->nodirmap = true;
621 return 0;
622 }
623
624 if (!chip->flash_region_mapped_ptr) {
625 chip->flash_region_mapped_ptr =
626 devm_ioremap(fiu->dev, (fiu->res_mem->start +
627 (fiu->info->max_map_size *
628 spi_get_chipselect(desc->mem->spi, 0))),
629 (u32)desc->info.length);
630 if (!chip->flash_region_mapped_ptr) {
631 dev_warn(fiu->dev, "Error mapping memory region, direct read disabled\n");
632 desc->nodirmap = true;
633 return 0;
634 }
635 }
636
637 if (of_device_is_compatible(fiu->dev->of_node, "nuvoton,npcm750-fiu")) {
638 gcr_regmap =
639 syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
640 if (IS_ERR(gcr_regmap)) {
641 dev_warn(fiu->dev, "Didn't find nuvoton,npcm750-gcr, direct read disabled\n");
642 desc->nodirmap = true;
643 return 0;
644 }
645 regmap_update_bits(gcr_regmap, NPCM7XX_INTCR3_OFFSET,
646 NPCM7XX_INTCR3_FIU_FIX,
647 NPCM7XX_INTCR3_FIU_FIX);
648 } else {
649 regmap_update_bits(fiu->regmap, NPCM_FIU_CFG,
650 NPCM_FIU_CFG_FIU_FIX,
651 NPCM_FIU_CFG_FIU_FIX);
652 }
653
654 if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN) {
655 if (!fiu->spix_mode)
656 npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
657 else
658 npcm_fiux_set_direct_rd(fiu);
659
660 } else {
661 npcm_fiux_set_direct_wr(fiu);
662 }
663
664 return 0;
665 }
666
npcm_fiu_setup(struct spi_device * spi)667 static int npcm_fiu_setup(struct spi_device *spi)
668 {
669 struct spi_controller *ctrl = spi->controller;
670 struct npcm_fiu_spi *fiu = spi_controller_get_devdata(ctrl);
671 struct npcm_fiu_chip *chip;
672
673 chip = &fiu->chip[spi_get_chipselect(spi, 0)];
674 chip->fiu = fiu;
675 chip->chipselect = spi_get_chipselect(spi, 0);
676 chip->clkrate = spi->max_speed_hz;
677
678 fiu->clkrate = clk_get_rate(fiu->clk);
679
680 return 0;
681 }
682
683 static const struct spi_controller_mem_ops npcm_fiu_mem_ops = {
684 .exec_op = npcm_fiu_exec_op,
685 .dirmap_create = npcm_fiu_dirmap_create,
686 .dirmap_read = npcm_fiu_direct_read,
687 .dirmap_write = npcm_fiu_direct_write,
688 };
689
690 static const struct of_device_id npcm_fiu_dt_ids[] = {
691 { .compatible = "nuvoton,npcm750-fiu", .data = &npcm7xx_fiu_data },
692 { .compatible = "nuvoton,npcm845-fiu", .data = &npxm8xx_fiu_data },
693 { /* sentinel */ }
694 };
695
npcm_fiu_probe(struct platform_device * pdev)696 static int npcm_fiu_probe(struct platform_device *pdev)
697 {
698 const struct fiu_data *fiu_data_match;
699 struct device *dev = &pdev->dev;
700 struct spi_controller *ctrl;
701 struct npcm_fiu_spi *fiu;
702 void __iomem *regbase;
703 int id;
704
705 ctrl = devm_spi_alloc_host(dev, sizeof(*fiu));
706 if (!ctrl)
707 return -ENOMEM;
708
709 fiu = spi_controller_get_devdata(ctrl);
710
711 fiu_data_match = of_device_get_match_data(dev);
712 if (!fiu_data_match) {
713 dev_err(dev, "No compatible OF match\n");
714 return -ENODEV;
715 }
716
717 id = of_alias_get_id(dev->of_node, "fiu");
718 if (id < 0 || id >= fiu_data_match->fiu_max) {
719 dev_err(dev, "Invalid platform device id: %d\n", id);
720 return -EINVAL;
721 }
722
723 fiu->info = &fiu_data_match->npcm_fiu_data_info[id];
724
725 platform_set_drvdata(pdev, fiu);
726 fiu->dev = dev;
727
728 regbase = devm_platform_ioremap_resource_byname(pdev, "control");
729 if (IS_ERR(regbase))
730 return PTR_ERR(regbase);
731
732 fiu->regmap = devm_regmap_init_mmio(dev, regbase,
733 &npcm_mtd_regmap_config);
734 if (IS_ERR(fiu->regmap)) {
735 dev_err(dev, "Failed to create regmap\n");
736 return PTR_ERR(fiu->regmap);
737 }
738
739 fiu->res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
740 "memory");
741 fiu->clk = devm_clk_get_enabled(dev, NULL);
742 if (IS_ERR(fiu->clk))
743 return PTR_ERR(fiu->clk);
744
745 fiu->spix_mode = of_property_read_bool(dev->of_node,
746 "nuvoton,spix-mode");
747
748 platform_set_drvdata(pdev, fiu);
749
750 ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
751 | SPI_TX_DUAL | SPI_TX_QUAD;
752 ctrl->setup = npcm_fiu_setup;
753 ctrl->bus_num = -1;
754 ctrl->mem_ops = &npcm_fiu_mem_ops;
755 ctrl->num_chipselect = fiu->info->max_cs;
756 ctrl->dev.of_node = dev->of_node;
757
758 return devm_spi_register_controller(dev, ctrl);
759 }
760
npcm_fiu_remove(struct platform_device * pdev)761 static void npcm_fiu_remove(struct platform_device *pdev)
762 {
763 }
764
765 MODULE_DEVICE_TABLE(of, npcm_fiu_dt_ids);
766
767 static struct platform_driver npcm_fiu_driver = {
768 .driver = {
769 .name = "NPCM-FIU",
770 .bus = &platform_bus_type,
771 .of_match_table = npcm_fiu_dt_ids,
772 },
773 .probe = npcm_fiu_probe,
774 .remove_new = npcm_fiu_remove,
775 };
776 module_platform_driver(npcm_fiu_driver);
777
778 MODULE_DESCRIPTION("Nuvoton FLASH Interface Unit SPI Controller Driver");
779 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
780 MODULE_LICENSE("GPL v2");
781